Siemens Sinumerik 840D sl Function Manual page 547

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System variable $A_FRDP_SUBS_ON
The system variable is used to indicate that substitute values are output to the
application.
0 = output of process values
1 = output of substitute values
System variable $A_FRDP_ACK_REQ
The system variable is used to signal that after a communication error, cyclic F
telegrams are again cyclically exchanged error--free -- and to acknowledge the
error and to output the process values, a user acknowledgment is still required via
the interface signal DB18.FRDP_ACK_REI or a channel_1 reset.
System variable $A_FRDP_DIAG
The system variable is used to indicate the cause of the communication error
determined by F_RECVDP.
Bit 0 -- 3: Reserved
Bit 4: 1 = timeout detected
Bit 5: 1 = sequence number error detected
Bit 6: 1 = CRC error detected
Bit 7 -- 12: Reserved
Bit 13: 1 = Discrepancies in the F telegram data (TelegramDiscrepancy)
Bit 14: 1 = Sign--of--life monitoring (LifeSign)
Bit 15: 1 = Asynchronous fault state (StateFault)
System variable $A_FRDP_SENDMODE
The system variable is used to indicate the actual operating mode of the F--CPU of
the F_SENDDP communication partner:
1: The F--CPU is in the deactivated safety mode
0: The F--CPU is in the safety mode
Note
For SINUMERIK 840D sl, the deactivated safety mode corresponds to the SPL
commissioning mode ($MN_PREVENT_SYNACT_LOCK == 0 or DB18.DBX36.0
== 0).
Note
Write access operations to all named system variables are only possible from the
program saved in program file /_N_CST_DIR/_N_SAFE_SPF reserved for the
SPL. Access operations from other programs are flagged as an error with Alarm
17070.
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SINUMERIK 840D sl/SINAMICS S120 SINUMERIK Safety Integrated (FBSI sl) - - 10.2015 Edition
Data Description
8.7 System variables
8-547